[[quoteright:254:http://static.tvtropes.org/pmwiki/pub/images/main_characters2.jpg]]
[[caption-width-right:254:[[MessianicArchetype Kamui]], [[IllGirl Kotori]] and [[DarkMessiah Fuuma]].]]
->''"The future hasn't been determined yet, right?"''
->-- '''Kotori'''

One of Creator/{{CLAMP}}'s longest-running manga (stalled at 18 volumes out of a planned 21 since 2003, with a few further chapters making a "Volume 19" never published in a tankoubon), ''X'' is the story of Kamui Shirou - a boy destined to save the world... or destroy it. He is drawing the Dragons of Heaven, who are attempting to preserve the world as it is, and the Dragons of Earth, who wish to eliminate humanity's taint, to [[TokyoIsTheCenterOfTheUniverse Tokyo]]. Guided by Hinoto, a dreamseer (''yumemi''), the Dragons of Heaven attempt to preserve the seven barrier structures situated around Tokyo. Kamui must decide if the world is even worth saving, and then choose sides... But what of the dreamseer's prophecy that there is another Kamui?

Note about the title: The true title of this series is simply ''X''. The manga was retitled as ''X/1999'' for release in America by Viz to prevent confusion with an American comic book series also named ''X''.[[note]]Viz's onmibus rerelease of the manga, though, goes back to simply being called ''X''.[[/note]] The 1999 portion comes from the year the story takes place.

There are actually two separate animated versions of ''X'': the 1996 movie, which is a great deal of action and way too much information compressed into an hour and a half, and the 2001 television series, which at 24 episodes had more time to actually develop the plot and featured a very different ending. Both are missing elements from the most recent manga chapters, suggesting yet a third very different ending.

The characters of Subaru, Seishirou and Hokuto originated from another CLAMP manga, ''Manga/TokyoBabylon''. Although it is sometimes referred to as such, ''Tokyo Babylon'' is not a {{Prequel}}, since the series predates ''X'' and the stories are independent. It is, however, helpful to know the plot of ''Tokyo Babylon'' before reading their subplot.

"Forever Love" by Music/XJapan (which ''also'' used to go only by X before they hit it big outside Asian market) was written as a theme song for this anime, and is the ending theme for TheMovie.

Not to be confused with the FourX [[SimulationGame Space Simulator]] series ''VideoGame/{{X}}'', the Nintendo tank game ''X'', [[VideoGame/MegaManX a reploid]], or with the '80s L.A. punk band ''Music/{{X}}''

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!!This series contains examples of the following tropes:

* AbsoluteCleavage: Kanoe.
* AffablyEvil: Seishirou and Yuuto both qualify.
** One could argue that Seishirou is more FauxAffablyEvil. Sure he's Unfunny at times, but you wouldn't be surprised if he whipped out a knife and started carving people up at any time.
* AlasPoorYorick: ''Multiple'' times.
** Kamui, Cradler of Decapitated Heads. Screamer of Anguished Screams. Especially in the movie.
* AlmostDeadGuy: Saiki Daisuke, nephew of Dragon of Heaven Aoki Seiichirou, several other characters.
* AntiVillain: [[spoiler:Fuuma]]. [[AlternateCharacterInterpretation Maybe]].
* AnyoneCanDie: Played straight several times, subverted once.
* ApocalypseOfTheWeek
* AppendageAssimilation: [[spoiler: Nataku's death in the anime]]
* ArcWords: Before Fuuma [[spoiler:awakens as Kamui's twin star,]] "Kamui, I am your..."
** Similarly, when [[spoiler: Fuuma's father dies]], he tries to say "[[spoiler: Fuuma]], you are Kamui's..." but kicks it before finishing.
* ArtEvolution: Faces especially get considerably more angular in later volumes, not surprising since it took over a decade to get the existing 18 volumes published.
* AsiaRuneChant - often used by mages.
* BeautyEqualsGoodness: Karen. Sorata [[GenreSavvy aptly points out in the manga]].
* {{Bishonen}} Apparently, there is an unspoken rule that there must be at LEAST one on every page.
** BishieSparkle: Fuuma, whenever he's playing basketball.
* BitterSweetEnding: The ending of the anime series: [[spoiler:Kamui deploys a ThanatosGambit in which his mortally-injured body turns into a barrier that reverses the damage by the Dragons of Earth, saving it from destruction in the process, while Fūma returns to his original self. In the last scene of the series, those characters who survived appear living happily: these include Arashi, Yuzuriha, Kusanagi, Aoki...]].
* BlandNameProduct: The computer Somy Vaoi that appears on the tv series.
* BreakTheCutie: [[spoiler: Kotori, Subaru, Kamui, Yuzuriha... most characters with any degree of cuteness, really.]]
* BringOutYourGayDead: [[spoiler:Kamui and Fuuma's mothers, who were lesbian lovers]] and arguably [[spoiler:Seishirou]].
* CharactersDroppingLikeFlies: In the film, [[spoiler:everyone dies except for Original!Kamui]].
* CherryBlossoms: Subverted from their usual tenderness and love aspect, they are the creepy symbol of the onmyouji assassin Sakurazukamori - also known as Sakurazuka Seishirou. This is also somewhat of a departure from CLAMP's other works, which generally use the conventional cherry blossom symbolism.
* ChildhoodMarriagePromise: Between Kamui and Kotori. [[spoiler: Too bad the latter was decapitated before it could be carried out.]]
* Creator/{{CLAMP}}, in the series that earned them the fannish exclamation OH CLAMP.
* ContinuityCameo: The ''Manga/CLAMPSchoolDetectives'' characters and the campus of CLAMP Academy.
* CrucifiedHeroShot: Several times and several characters, perhaps most [[{{Anvilicious}} Anviliciously]] [[http://static.tvtropes.org/pmwiki/pub/images/kotori_crucified.png this one]] (spoiler warning). Kamui even retains [[WhatDoYouMeanItsNotSymbolic scars on both hands]].
* DateCrepe: Seishirou invites Fuuma to go get crepes with him (having just finished blowing up a major train line and a large skyscraper). His reasoning is that if they are going to destroy all of Tokyo, then they might as well get to sample delicious foods first. It's very romantic, in a creepy way.
* DeathByChildbirth: Subverted, since Tokiko, Saya and in the movie [[spoiler:IllGirl Kotori]] die after giving birth to [[spoiler:sentinent swords called, Shinken.]]
* DiedInYourArmsTonight: [[spoiler: Seishirou's death while Subaru holds him.]] Ironic since [[spoiler: Hokuto died in ''his'' arms]]
** And in TheMovie, [[spoiler: Yuzuriha and Kanoe die in Kamui's and Hinoto's arms, respectively.]]
** In the anime, we have [[spoiler: Sorata dying in Arashi's arms, Hinoto dying in Kamui's, and Karen dying in Aoki's.]]
* DownerEnding: The Movie.
* DroppedABridgeOnHim: [[spoiler: Seishirou; quite literally. Not only was the means of his death [[RetCon retconned in by way of Hokuto]], but he was, in effect, [[RedemptionEqualsDeath committing suicide for having fallen in love with Subaru, something he had said he was incapable of]] and [[BreakTheCutie further mentally-deranging said love interest by making him the unwilling means of his suicide]]. [[ThanatosGambit Oh, CLAMP]].]]
** Events described happened on a [[VisualPun literal crumbling bridge]]
* DuelingMessiahs: Invoked by Kamui vs. Fuuma; Kamui is to decide whether the world is worth saving or not and to fight for whatever side he chooses, while Fuuma is destined to oppose him.
* DyingDeclarationOfLove: Seishirou's last words... we assume.
* ElementalRockPaperScissors: Karen is a pyrokinetic, Aoki has powers over wind, Yuuto manipulates water, Kusanagi has a power related to earth, Sorata seems to have an affinity with lightning as well as his esoteric Buddhism powers.
* EmpathicWeapon: Played straight with the Shinken, but later on subverted; even though the two Shinken can be wielded properly only by Kamui and are shown to be genetically identical to human beings and are somehow understood to be "crying" in grief over humanity's gruesome destiny to be decided during the Final Battle, Kamui ultimately seals the power of the Shinken [[spoiler: so that Fuuma, who has awakened as his Twin Star and is attempting to kill him, cannot use the first Shinken against Kamui]], rendering the Shinken's power null and void for roughly half the series.
* EmotionlessGirl: Arashi is essentially this crossed with a DeadpanSnarker, her usual response to Sorata being "[[VisibleSilence ...]]". She does gain more emotion as the series goes on [[spoiler: and when this happens, it's her downfall, as she either dies (movie) or pulls a FaceHeelTurn (TV series, probably manga)]] Note that [[spoiler: her FaceHeelTurn is halfhearted at best, and in the anime it results in the destiny that she was trying to prevent by changing sides. YouCantFightFate, you know?]]
*** [[spoiler: The hiatus-ridden 19th Chapter has Evil Hinoto claiming that she's going to make Arashi BrainwashedAndCrazy to join the Dragons of Earth. Which makes... as much sense as her willing changing sides, I guess?]]
** Nataku and Satsuki count as well.
* TheEndOfTheWorldAsWeKnowIt: Kinda the whole point.
** Emphasis on the "As We Know It" part. Basically, the Dragons of Heaven are fighting to protect mankind, and the Dragons of Earth want to wipe out mankind to save the Earth from the evils of man. The great thing about this story is that no one is in it ForTheEvulz... Except Yuuto. ''Maybe'', because it '''is''' Yuuto.
* EvilAlbino: Subverted; Kamui is at first downright hostile toward the white-haired Princess Hinoto, but she turns out to be a pretty gentle person. [[spoiler: Until, of course, it's revealed that Hinoto has a latent EvilTwin persona residing within the depths of her soul who gathered the Dragons of Heaven together solely so that she could dispatch them each to their own ironic deaths. Oh, CLAMP.]]
** Also eventually subverted with [[spoiler: Nataku, who was less "evil" and more "didn't know better, stopping killing, and then performed a HeroicSacrifice for Karen."]]
* EyeScream: [[spoiler:Subaru]]. Because it's not a CLAMP manga until ''someone'' loses an eye.
* FaceHeelTurn: [[spoiler: Arashi becomes a Dragon of earth, though it is subverted in that she did it to protect Sorata from his pre-ordained death, and in the anime eventually rejoins the Dragons of Heaven.]]
** Also, [[spoiler:Subaru]] replaces [[spoiler:Seishirou]] as a Dragon of Earth in the manga. OTOH, it's unclear as to whether he really accepts the offer to change sides. [[spoiler: He takes the offer to become the Sakurazukamori, but as to whether that means he's going to act as a Dragon of Earth isn't shown. Though he is shown in the half volume 19 to be with Fuuma during the Final Battle, apparently to help Kamui realize his "true wish".]]
* FemmeFatalons, Kanoe has long, most likely faux nails.
* FirstKiss
* FlashForward, in particular Kamui's recurring dream of the Final Battle.
* FunctionalMagic: Two onmyouji, and a bit of esoteric Buddhism.
* FriendToAllLivingThings: Kotori, Yuzuriha and Kusanagi, notably subverted in that the latter is a middle aged ''man'' in the Self-Defense Force.
** And that Kusanagi is a Dragon of Earth, which makes him more of a "Friend to All Living Things Other Than People." The trope does not apply at all in the movie, in which Kusanagi - one of the characters most altered by the adaptation - comes across as more of a violent thug and [[spoiler:helps kill Yuzuriha without ever establishing a relationship with her]].
* [[GaiasVengeance Gaia's Avengers]]: The Dragons of Earth
* GenkiGirl: Nekoi Yuzuriha, though not nearly so over-the-top as most instances of the trope.
* GeodesicCast: Seven Dragons of Heaven on the good guys' side, and seven Dragons of Earth on the bad guys' side. Plus two dreamseers who are sisters on each side.
* {{Gorn}}: [[CruelAndUnusualDeath Most deaths]] in the Manga are extremely gory, often with the intestines coming out. In example, [[spoiler: Kotori's death by stabbing and dismembering was ''so'' bad that the TV series drew the line at the "dismembering" part.]]
** Several deaths from the movie aren't exactly pleasing to watch either. [[spoiler: DAMMIT, YUUTO!]]
* GreenAesop: In the anime, Fuuma repeatedly delivers a HannibalLecture to this effect.
* HackTheTrafficLights: Satsuki Yatoji's introduction: hacking a street light from her cellphone.
* HackerCave: The headquarters for the Dragons of Earth, built around the supercomputer Beast.
* HeelFaceTurn: [[spoiler: In the TV series, Dragon of Earth Kusanagi threatens to kill Fuuma for trying to finish off Yuzuriha. Later he defects from the Dragons of Earth to protect an injured Yuzuriha. Arashi's U-turn applies here as well.]]
** In the manga, [[spoiler:Nataku also makes a HeroicSacrifice to protect Karen. It's sort-of explained in that she looked like the mother of her past self Kazuki and she tried to reach for him before his death.]]
* HeroicAlbino: Princess Hinoto. [[spoiler: Subverted, as she's genuinely heroic... but her ''SuperpoweredEvilSide'' is more or less planning to allow mankind to be wiped out so that she can continue to be the Dreamseer. Hinoto herself is pretty horrified at that idea.]]
* HeroicBSOD: Several characters, most notably [[spoiler: Kamui after Kotori is brutally killed]].
** Also, Subaru. For the second time in his history, though the first was before X began in a series called Tokyo Babylon.
* HeroicSacrifice: [[spoiler: Sorata and Karen]] in the anime, [[spoiler: Kotori and Nataku]] in the manga, [[spoiler:fully half the Dragons of Heaven]] in TakingYouWithMe moments in the movie.
** Also, [[spoiler: TV series!Hinoto, who stabs herself to death to kill her SuperpoweredEvilSide and save Sorata and Kamui.]]
* HeyItsThatVoice: More of a HilariousInHindsight if you're a fan of the Digimon Frontier dub, in which the voice actors of [[Creator/SteveStaley Kamui]] and [[Creator/CrispinFreeman Fuuma]] play long lost brothers. However, in this story, Fuuma goes from being neutral to bad to good rather than his path in X. Bonus points for the voice actress of [[Creator/MichelleRuff Kotori]] playing their only female teammate.
** Kamui is also [[Manga/{{Bleach}} Captain Hitsugaya]]
** Arashi is [[Anime/TheBigO R. Dorothy Wayneright]] while Seiichiro Aoki is her [[Anime/TheBigO employer]]. Karen is [[Anime/TheBigO still pining over someone she can't have]].
** Aoki is also [[Anime/CowboyBebop Spike]] and Karen is also [[Anime/CowboyBebop Faye]]. Though as opposed to then ends of those characters in that anime, [[spoiler: Karen is the one who dies]].
** Subaru is a sensei to a [[Manga/{{Naruto}} genin team]].
** Satsuki upgraded Beast into a Knightmare Frame in ''Anime/CodeGeass''.
** Fuuma is [[Manga/{{Hellsing}} Alucard]] and [[Manga/{{Naruto}} Itachi]].
*** Also [[Anime/{{Noein}} Karasu.]] And [[Franchise/GhostInTheShell Togusa]]. Oh, just go to [[Creator/CrispinFreeman his page already]].
** Kanoe is [[Anime/CodeGeass Cornelia Li Britannia]] and [[Franchise/GhostInTheShell Major Motoko Kusanagi]].
** Daisuke Saiki is none other than [[Manga/RurouniKenshin Kenshin]].
* HighPressureBlood: Mostly in the movie.
* HimeCut: Arashi.
* HookerWithAHeartOfGold: Karen, a Soapland call girl, who, interestingly enough, is [[ChristianityIsCatholic Catholic]].
* HugeGuyTinyGirl: Kusanagi and Yuzuriha in the anime. Justified, as he's a grown man (albeit a particularly huge one) and she's only 14.
* IHaveTheHighGround: virtually every single character at one point or another.
* InstantAIJustAddWater
* InvisibleToNormals: The battles are contained in alternate reality pockets called ''kekkai'', or barrier fields. However, the damage to the real world becomes quite real if the person who created the barrier is killed. See: PhantomZone.
* JapaneseChristian: Karen Kasumi
* {{Joshikousei}}: Arashi's early appearances.
* JourneyToTheCenterOfTheMind: Subaru has to use this to bring Kamui back from an epic HeroicBSOD.
* KickTheDog: Played straight a few times, then totally subverted when [[spoiler: Fuuma ''doesn't'' kill a little girl [[AndYourLittleDogToo and her little frog toy]] because she wants to live]].
* KillEmAll: ''Definitely'' in the movie, where [[spoiler: everybody but Kamui [[EveryBodysDeadDave is dead]] by the end]]. And it seems [[spoiler: the manga might be heading towards that, too]].
** The manga, not so much, considering several beaten Dragons are still alive and kicking. But yes, in every version there are several casualties. The anime is particularly light on the casualties , so the manga seems to be walking the line between the two.
* KillTheCutie: [[spoiler: Kotori]]. At least she was in an AngstComa when [[spoiler: her brother murdered her.]]
* LateArrivalSpoiler: Though it's treated as a major surprise when it happens, the fact that [[spoiler: Fuuma]] pulls a FaceHeelTurn and becomes the main antagonist is pretty evident after one look at the official art of the opening of the TV series. It's also foreshadowed pretty heavily in the manga, but the twist is in '''how''' it happens: [[spoiler:Kamui is forced to pick which side he wants to fight on, without knowing that his decision will compel Fuuma to fight for the opposite side, '''no matter what'''. And his decision is based on ''his desire to protect Fuuma and Kotori'']]. OW. It's little wonder it puts him in a HeroicBSOD that requires a JourneyToTheCenterOfTheMind to snap him out of it.
* LiteralGenie: [[spoiler: Fuuma]], who is just about the embodiment of BeCarefulWhatYouWishFor.
* LoveMakesYouEvil: [[spoiler: Subaru becoming the Sakurazukamori after Seishirou's death in the manga, although it's not loving him that do it so much as ''[[SuicideByCop getting tricked into killing him]]'']]. Also, if we count sibling love, [[spoiler: in the manga and the movie Kanoe's motivations to lead the Dragons of the Earth is her love for her sister Hinoto, whom she wants to free from her BlindSeer position which is tightly tied to her leadership of the Dragon of Heaven.]]
** [[spoiler: Subaru's goal for most of the series is to commit suicide by assassin, too. So the fight between Seishirou and Subaru is really [[MurderSuicide two people trying to get killed by each other]].]]
* MailerDaemon: ''Beast'', Satsuki's computer, which is obsessed with its builder and owner. And territorial to boot.
* ThatManIsDead: "[[spoiler:Kishu Arashi]] of the Dragons of Heaven is no more. [[FaceHeelTurn I am with the Dragons of Earth!]]"
* TheMinnesotaFats: Sakurazukamori, and the "other" Kamui [[spoiler: Fuuma]].
* ModestyBedsheet: Kanoe.
* CanonWelding: The series has been tied with ''Manga/CLAMPSchoolDetectives'', ''Manga/TokyoBabylon'' and the {{Alternate Universe}}s of ''Manga/TsubasaReservoirChronicle''/''Manga/XxxHOLiC''.
* MoralDissonance: Kamui promises to save [[spoiler: Fuuma]], even if it means doing him physical harm, to which [[spoiler: Fuuma]] implies in response that Kamui will have to be willing [[ShootYourMate to do much more than harm him]]. [[spoiler: He finds a sort-of solution in the TV series. [[ThanatosGambit Emphasis on]] [[HeroicSacrifice sorta]].]]
* MrExposition: [[TheLancer Sorata]], especially in the anime. Hinoto chips in.
* MySignificanceSenseIsTingling: The Dragons can innately sense when a kekkai is raised or broken (and often who raised it), which usually indicates that a battle is imminent.
* NietzscheWannabe: The Dragons of Earth, with elements of SocialDarwinist and Gaea philosophy.
* NoblewomansLaugh: Kanoe, and a damn scary one it is, too.
* NoEnding: The last manga chapter was released in 2003. CLAMP last seriously talked about the series in 2005, saying they were still looking for a publisher to handle the series. The [[BloodierAndGorier increasingly violent content in the series]] created problems as some of the events ended up very reminiscent of real-world disasters at the time. Now that we're a ''decade'' in, it's seeming increasingly likely that CLAMP has simply moved on and will leave the series unresolved.
* NoEndorHolocaust: Averted, and in a series where the destruction done by the battles can be retconned out of existence by way of barrier fields, no less. Lets you know how rough the fights usually are on the heroes.
* OddFriendship: Yuzuriha (a schoolgirl) and Shiyuu Kusanagi (a middle-aged man in the Self-Defense Force).
** Friendship. Riiiight. Yuzuriha definitely has a crush on him. For the most part he acts like a responsible adult though.
* OedipusComplex: Seishirou, who had an... interesting relationship with his mother, Setsuka [[spoiler: before he killed her and took over her position]].
* OffModel: The anime. Apparently QUALITY faces are a side effect of the Shoujo Armageddon.
** And this is ''despite'' being a work by Creator/YoshiakiKawajiri, who is known for mostly averting this.
* OlderThanTheyLook: [[spoiler: Seishirou]]'s mother looked barely the same age as him when he was a teenager, which he lampshades in the dramas. Also, Hinoto (she definitely doesn't look older than Kanoe).
* OneSteveLimit: There's a Sei''ichi''rou (Aoki) in the Heaven Dragons and a Sei''shi''rou (Sakurazuka) in the Earth Dragons. To avoid confusion, the former is commonly referred by his surname.
* TheOnlyOneAllowedToDefeatYou: Kamui and Fuuma, Subaru and Seishirou.
* OnlyOneName: Hinoto and Kanoe.
* OrdinaryHighSchoolStudent: Fuuma and Kotori at first, subverted with Kamui, who in the anime series used his powers to fight other kids. In the manga, the younger Seals try to keep up this cover story by transfering to CLAMP Academy. Subaru does a REALLY poor job of passing for an Ordinary College Student.
** Keiichi is a more straight example.
* ParentalAbandonment: Several cases, ranging from simply sad to downright terrible: [[spoiler: Poor Saya and Kyougo]].
* PerpetualMolt: Both Kamui and [[spoiler:Fuuma]], apparently, to produce the huge number of loose feathers drifting through Important Scenes.
* ThePollyAnna: Keiichi.
* RedEyesTakeWarning: [[http://static.tvtropes.org/pmwiki/pub/images/054.jpg Fuuma]] in the anime series, in contrast to his gold-eyed manga counterpart.
* RefusalOfTheCall: Kamui, at first, with elements of TheCallKnowsWhereYouLive, though it turns out [[spoiler: his mother, Tohru, essentially killed herself to ''force'' him to go]].
* {{Roofhopping}}: This is apparently the only way to get around, and yet no one ever seems to end up getting a PantyShot of [[MagicSkirt Arashi]]. Also, no bystanders seem to take notice.
* RooftopConfrontation: In the film, the final battle takes place on the roof of a tall building.
* ScaryShinyGlasses: Fuuma in the manga, though it's more to indicate that [[spoiler: he's awakened as the "other" Kamui]] than to hide his feelings.
* ScryVsScry
* SingleStrokeBattle: Definitely in the ''X'' movie, much less in the TV series which has time and SFX monies for big fight scenes. The TV series was closer to the manga in terms of fight length.
* ShadowArchetype: One interpretation of [[spoiler:Fuuma]]'s strange [[TheAntiChrist anti-Christ]] character is that he's a reflection of Kamui's darkest thoughts and desires.
* ShootYourMate: More like "run your mate through". With your ''hand''. Seishirou can give you tips on proper technique. And also Fuuma, who seems intent on running his pal Kamui through with that 5-foot long sword of his. Best friends: always there to kill you off with a giant pointy thing in the CLAMP universe.
* ShoutOut: Characters appear from ''Manga/CLAMPSchoolDetectives'', an earlier series by the same authors. In addition, Aoki is based on one of CLAMP's editors.
** Subaru, his twin sister Hokuto, and Seishirou are from a series called Tokyo Babylon.
* SlapYourselfAwake: Karen drugs Aoki in order to take his place in an upcoming duel she believes he won't survive. Aoki stabs himself in the leg with a kitchen knife to keep himself awake long enough to stop her. [[spoiler: She still dies.]]
* TheSpock: Satsuki.
* SpoilerOpening: Showing [[spoiler: Fuuma]] engaged in combat with Kamui and looking evil.
* SpontaneousHumanCombustion: Kamui's mom Tohru spontaneously combusted in the BackStory. The reason for this, however, was made pretty clear: [[spoiler: She made herself a shadow sacrifice of the entire planet Earth and, by burning to death, delayed its destruction by GlobalWarming.]] ItMakesSenseInContext.
* SproutingEars: Mostly on Yuzuriha, possibly a reference to her connection to dogs.
** Or cats, given her last name ([=NEKOi=]) and occasional sprouting cat tail.
* SummonToHand: Inverted- Arashi's sword is summoned out of her open palm when needed.
* StoryboardingTheApocalypse: There's a reason the series is referred to as either "The Emocalypse" or "Shoujo Armageddon".
* SwordFight: With capes and living swords for the ''fate of the world'', no less.
* TalkingToHimself: Or, in this case, ''herself''. Wendee Lee, in addition to playing main character Karen, voices ''both'' of Kotori's friends in the English version.
* TakeMyHand: Kamui has two scenes in which this trope is used, they are parallel: in both he saves Kotori from plummeting to her death, once when they were both children in a flashback sequence and later during the story proper.
** In the movie, he gets an extra one to save Yuzuriha to plummet to her death during their fight against Yuuto and Kasanagi.
* TakingYouWithMe: [[spoiler: Karen to Yuuto]] in the TV series. [[spoiler: It ''seems'' to fail when she dies, but he ultimately perishes as well.]] In the movie, [[spoiler: Subaru to Seishirou, Karen to Shougo and Aoki to Nataku]]. Not yet invoked in the manga. Notice the ''yet''.
* TarotMotifs: There was an actual ''X'' tarot deck produced as a promotional item, and all the major characters are associated with one of the major arcana cards.
* TheTokyoFireball: Each time a barrier is destroyed, it gets progressively worse.
* TokyoIsTheCenterOfTheUniverse, rather literally, as the many kekkais in the city must first be removed before the Apocalypse can proceed elsewhere.
* TooGoodForThisSinfulEarth: [[spoiler: Poor Kotori]].
* TooSoon: Cause of several publication hiatuses during the initial run of the manga, and possible cause of the current hiatus as well. Thematic elements like the decapitations and seismic disturbances bore coincidental but unsettling resemblances to real-life events such as the Sakakibara murders and the Great Hanshin Earthquake, leading to the series being pulled from publication repeatedly. CLAMP denies ExecutiveMeddling was responsible for the 2003 hiatus, stating that they themselves made the decision to cease publication as they were convinced the planned ending would not have been socially acceptable ''at that time''. The global climate around urban terrorism and national security may have been a major factor in that decision.
* TwentyMinutesIntoTheFuture: When it started publication, at least. Now it qualifies as [[AlternateUniverse Alternate Continuity]] and the creators admit they guessed wrong on some technological details, like failing to anticipate the rise of cellphones.
* UrbanFantasy
* VillainsOutShopping: Seishirou, Yuuto, Satsuki[[spoiler:, and Fuuma]]; when they're not busy [[TheTokyoFireball rendering smouldering ruination of monumental Tokyo skyscrapers]], they take time for tea parties and trips to gourmet ice cream joints. Of course, Seishirou's been pretty much doing that for years.
* VirginPower: [[spoiler:Arashi's, apparently]]. An alternate interpretation is that the character just ''thinks'' this is the case and it's psychosomatic. [[spoiler: [[GenerationXerox Her mom went through the same trial]], after all.]]
** She still has her sword afterward. Just saying.
* WaifProphet: White-haired, [[ReallySevenHundredYearsOld child-like looking]] Hinoto-hime has [[BlindSeer been blind, deaf, mute and weak-limbed since birth]]. Also, Kakyou, who's been slowly dying in the grips of a coma for years.
* WhamEpisode: [[spoiler:Kamui chooses to be a Dragon of Heaven, Fuuma in turn fills the role of Kamui in the Dragons of Earth and kills Kotori by [[WhatDoYouMeanItsNotSymbolic crucifying, stabbing and then dismembering her]] and [[ShipTease licking Kamui's neck while pinning him to a wall with shards of glass]], leaving Kamui in an absolutely ''epic'' HeroicBSOD, which in the manga has him ''cradling Kotori's severed head'' a la Devilman.]] All this is ''less than 23 minutes'' in the anime... And the first 10-15 minutes of that episode is mostly exposition.
* WorthLivingFor: Kamui needs saving.
* WillTheyOrWontThey: Though in one case, they actually ''do'' ([[spoiler: Arashi and Sorata]]) and it's a big deal for both plot and characterization.
* WordOfGod: [[spoiler:Seishirou and Nataku]] are dead. Deader than disco. They won't be coming back. Also, Kotori's hair reminds the artists of Udon. Really.
** Paraphrasing Ohkawa, '' Kamui and Fuuma are more than friends. They used to be friends, but they are definitely past that point now. [[DepartmentOfRedundancyDepartment Please, Mr. Interviewer, don't refer to them as friends, that's not correct]].'' Oookay then.
* YaoiGuys: C'mon, it's a Creator/{{CLAMP}} series... Seishirou and Subaru are the clearly preexisting relationship in this case.
* YouCantFightFate: Though, there are elements of BecauseDestinySaysSo as well. CLAMP's newer series ''TsubasaReservoirChronicle'' and ''Manga/XxxHOLiC'' suggest that their view of fate is complex but that it can be altered to some extent.
** It's interesting to note that in said series, in Acid Tokyo, Fuuma and Kamui are leading the opposite groups to what they do in X, which are, incidently the sides ''fate'' had destined them to fight on in X ''before'' Kamui decided to choose otherwise.
* YouHaveOutlivedYourUsefulness: In the movie [[spoiler: Kusanagi and Yuuto (OUCH!)]], in the TV series [[spoiler:Nataku]], in the manga [[spoiler:''Hinoto'' (or better said, her SuperpoweredEvilSide]] invokes this against [[spoiler:her own sister Kanoe]].
** [[spoiler: In the anime, Nataku didn't outlive his usefulness. It's just that he became more useful by not living.]]

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